Thank you all for your replies and advice especially Mr. Eacott.
Regarding VCAT and land use, perceived loss of amenity, etc, I would imagine that if I can prove that the aircraft noise footprint meets Australian standards ANEF 20 contour, is quieter than a chain saw, etc., etc. then case closed.
I think I can easily achieve this using a Rotax 912 which meets European noise standards.
Jaba, your video has a distinct relationship to what I had in mind, but with a little more tree clearance.
As for the boat, ever heard of Raymond Island?